#34 support More() and Buffered()

feature_adapter.go

@@ -112,4 +112,13 @@ type AdaptedDecoder struct {
 func (adapter *AdaptedDecoder) Decode(obj interface{}) error {
 	adapter.iter.ReadVal(obj)
 	return adapter.iter.Error
+}
+
+func (adapter *AdaptedDecoder) More() bool {
+	return adapter.iter.head != adapter.iter.tail
+}
+
+func (adapter *AdaptedDecoder) Buffered() io.Reader {
+	remaining := adapter.iter.buf[adapter.iter.head:adapter.iter.tail]
+	return bytes.NewReader(remaining)
 }

jsoniter_adapter_test.go

@@ -5,15 +5,30 @@ import (
 	"github.com/json-iterator/go/require"
 	"encoding/json"
 	"bytes"
+	"io/ioutil"
 )
 
 func Test_new_decoder(t *testing.T) {
 	should := require.New(t)
-	decoder1 := json.NewDecoder(bytes.NewBufferString(`[1]`))
-	decoder2 := NewDecoder(bytes.NewBufferString(`[1]`))
+	decoder1 := json.NewDecoder(bytes.NewBufferString(`[1][2]`))
+	decoder2 := NewDecoder(bytes.NewBufferString(`[1][2]`))
 	arr1 := []int{}
 	should.Nil(decoder1.Decode(&arr1))
 	should.Equal([]int{1}, arr1)
 	arr2 := []int{}
+	should.True(decoder1.More())
+	buffered, _ := ioutil.ReadAll(decoder1.Buffered())
+	should.Equal("[2]", string(buffered))
 	should.Nil(decoder2.Decode(&arr2))
+	should.Equal([]int{1}, arr2)
+	should.True(decoder2.More())
+	buffered, _ = ioutil.ReadAll(decoder2.Buffered())
+	should.Equal("[2]", string(buffered))
+
+	should.Nil(decoder1.Decode(&arr1))
+	should.Equal([]int{2}, arr1)
+	should.False(decoder1.More())
+	should.Nil(decoder2.Decode(&arr2))
+	should.Equal([]int{2}, arr2)
+	should.False(decoder2.More())
 }